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14. In a survey carried out in a large city, 170 households out of a random sample of 250 owned at least one pet. Find

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14. In a survey carried out in a large city, 170 households out of a random sample of 250 owned at least one pet. Find the 95 per cent confidence interval for the percentage of households in the city who own at least one pet. Does the result support a pet food manufacturer's claim that 75 per cent of all households have at least one pet

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